QUESTION 23 (3 marks)
Describe differences between r-selected and K-selected species in terms of:
• number of offspring
• parental care and involvement
QCAA guide · typeset solution
QCAA sample response and mark allocation
23 | r-selected species generally have a high number of offspring whereas K-selected species have a low number. r-selected species have less parental care or involvement with offspring whereas K-selected species have high care. r-selected species have shorter lifespans whereas K-selected species have longer lifespans. | • describes r-selected as high number of offspring and K-selected as low number of offspring [1 mark] • describes r-selected as low care and K-selected as high care [1 mark] • describes r-selected as short lifespan and K- selection as long lifespan [1 mark] | ||
QCAA sample response and marking criteria reproduced from the official guide.
Compare your working with the guide above.